注意
转到末尾以下载完整的示例代码。
日期刻度定位器和格式化器#
此示例说明了各种日期定位器和格式化器的用法和效果。
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.dates import (FR, MO, MONTHLY, SA, SU, TH, TU, WE,
AutoDateFormatter, AutoDateLocator,
ConciseDateFormatter, DateFormatter, DayLocator,
HourLocator, MicrosecondLocator, MinuteLocator,
MonthLocator, RRuleLocator, SecondLocator,
WeekdayLocator, YearLocator, rrulewrapper)
import matplotlib.ticker as ticker
def plot_axis(ax, locator=None, xmax='2002-02-01', fmt=None, formatter=None):
"""Set up common parameters for the Axes in the example."""
ax.spines[['left', 'right', 'top']].set_visible(False)
ax.yaxis.set_major_locator(ticker.NullLocator())
ax.tick_params(which='major', width=1.00, length=5)
ax.tick_params(which='minor', width=0.75, length=2.5)
ax.set_xlim(np.datetime64('2000-02-01'), np.datetime64(xmax))
if locator:
ax.xaxis.set_major_locator(eval(locator))
ax.xaxis.set_major_formatter(DateFormatter(fmt))
else:
ax.xaxis.set_major_formatter(eval(formatter))
ax.text(0.0, 0.2, locator or formatter, transform=ax.transAxes,
fontsize=14, fontname='Monospace', color='tab:blue')
日期刻度定位器#
locators = [
# locator as str, xmax, fmt
('AutoDateLocator(maxticks=8)', '2003-02-01', '%Y-%m'),
('YearLocator(month=4)', '2003-02-01', '%Y-%m'),
('MonthLocator(bymonth=[4, 8, 12])', '2003-02-01', '%Y-%m'),
('DayLocator(interval=180)', '2003-02-01', '%Y-%m-%d'),
('WeekdayLocator(byweekday=SU, interval=4)', '2000-07-01', '%a %Y-%m-%d'),
('HourLocator(byhour=range(0, 24, 6))', '2000-02-04', '%H h'),
('MinuteLocator(interval=15)', '2000-02-01 02:00', '%H:%M'),
('SecondLocator(bysecond=(0, 30))', '2000-02-01 00:02', '%H:%M:%S'),
('MicrosecondLocator(interval=1000)', '2000-02-01 00:00:00.005', '%S.%f'),
('RRuleLocator(rrulewrapper(freq=MONTHLY, \nbyweekday=(MO, TU, WE, TH, FR), '
'bysetpos=-1))', '2000-07-01', '%Y-%m-%d'),
]
fig, axs = plt.subplots(len(locators), 1, figsize=(8, len(locators) * .8),
layout='constrained')
fig.suptitle('Date Locators')
for ax, (locator, xmax, fmt) in zip(axs, locators):
plot_axis(ax, locator, xmax, fmt)
日期格式化器#
formatters = [
'AutoDateFormatter(ax.xaxis.get_major_locator())',
'ConciseDateFormatter(ax.xaxis.get_major_locator())',
'DateFormatter("%b %Y")',
]
fig, axs = plt.subplots(len(formatters), 1, figsize=(8, len(formatters) * .8),
layout='constrained')
fig.suptitle('Date Formatters')
for ax, fmt in zip(axs, formatters):
plot_axis(ax, formatter=fmt)
参考
此示例中显示了以下函数、方法、类和模块的用法
脚本的总运行时间: (0 分钟 4.031 秒)